Looks like a starting capacitor when out in my IR 7.5HP compressor - question - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-24-2014, 05:17 PM
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Looks like a starting capacitor when out in my IR 7.5HP compressor - question

My Ingersoll Rand 7.5HP compressor which is only a little over 2 years old went out on me this evening.

First sign of trouble was that it blew the breaker last week. Then today it blew the breaker again but when I reset it, the motor would hum and only try to start turning. So, I shut it down and took the cover off the box on top of the motor and found that it has 3 capacitors in there. One large white one and 2 identical black ones. One of the black ones had blown open and the insides were coming out.

My question is should I replace all three of the capacitors, both the black ones or just the one that is blown open?

The black ones say 340...408uF 250/275V and the large white one says 60uF 400V.

I have no idea if anyone locally will carry these but I'll make some calls in the AM.

Advice will be appreciated.

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Old 03-24-2014, 06:22 PM
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Maybe one of these will work.
Look at the schematic of the motor to see if the blown ones are the start capacitors or the run capacitors.(probably the start caps)

Capacitors | Motor Start Capacitors | Product Catalog Search Results | Galco Industrial Electronics

Maybe post a picture of the caps so we can see what style they are.

Oh and the little u stands for "Micro" and the F stands for Farad. like 340- 408 Microfarads ( uF)
Voltage rating also has to be the same
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Old 03-24-2014, 06:28 PM
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Maybe here...

Motor Run Capacitor products - Grainger Industrial Supply
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Old 03-24-2014, 06:31 PM
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here are some on e bay
http://www.ebay.com/itm/Start-Capaci...item3a7901a4c6
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Old 03-24-2014, 07:42 PM
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Here's a couple of local guys for you to call.
San Angelo Electric Motor Repair. 236 E 5th St, San ... (325) 658-1297.
Indeco Industrial Electric Co. 65 E Avenue K, San ... (325) 653-4255

The black ones are run caps. I'd replace both and keep the non leaking one for next time.
Those caps can be bought on the internet for about $14 apiece.

Good luck

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Old 03-24-2014, 08:16 PM
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Quote:
Originally Posted by boothboy View Post
Here's a couple of local guys for you to call.
San Angelo Electric Motor Repair. 236 E 5th St, San ... (325) 658-1297.
Indeco Industrial Electric Co. 65 E Avenue K, San ... (325) 653-4255

The black ones are run caps. I'd replace both and keep the non leaking one for next time.
Those caps can be bought on the internet for about $14 apiece.

Good luck

BB
Thanks. Those 2 places were first on my list to call in tomorrow.

Btw, the black ones say "Motor Start" on them. Looks like the brand name is EPCOS.
The brand on the white one is WEG which is what the motor itself is.

Did you look at a schematic to see that the 2 black ones are run caps? I haven't looked at the manual yet. It is on a CD that came with it.

Sounds like it's unanimous that I should replace both black ones and that makes sense. I'll update here with what I find out from those shops tomorrow.
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Old 03-24-2014, 08:35 PM
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Quote:
Originally Posted by roger1 View Post
Thanks. Those 2 places were first on my list to call in tomorrow.

Btw, the black ones say "Motor Start" on them. Looks like the brand name is EPCOS.
The brand on the white one is WEG which is what the motor itself is.

Did you look at a schematic to see that the 2 black ones are run caps? I haven't looked at the manual yet. It is on a CD that came with it.

Sounds like it's unanimous that I should replace both black ones and that makes sense. I'll update here with what I find out from those shops tomorrow.
Nope I Googled the numbers and the answer ID'ed them. When ever you want a part Goggle the number and you'll find out who has them and how much. It works on just about anything,

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Old 03-24-2014, 09:34 PM
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I myself, would change them all out. Then I would make darn sure my check valve was holding and the unloader was bleeding out. Those go for 2 reasons.

1) Starting under load ( check valve / bleeder bad )

2) Low voltage ( never use extension cords / power outage when in use )

Once one pops, they all have been stressed. Unless you have horrible luck and the start switch broke, then you need one of those and a set of capacitors.
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Old 03-25-2014, 03:42 AM
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The compressor was running when it blew the breaker, right? so Change them all ,you can order them from surplus supply very reasonably...
Capasitors will hold a charge so be sure to unplug the unit and discharge the capasitors before trying to replace them ,all you do is short the terminals together to discharge them just in case one is still good...
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Old 03-25-2014, 12:02 PM
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Up and running. Bought 2 new starting capacitors

So I found 2 places locally that had 340-408 MFD 250V starting capacitors in stock.

One was $27.72 a piece and the other was $13.63 a piece. Naturally, I went to the one with the better price. The guy told me that it was indeed a good idea to replace both the starting caps but if the running cap looks good on the outside, that it's most likely good.
So that's what I did. He did tell me to make sure that the motor starts well and gets to speed quickly. It does. Sounds like it's new again. The unloader sounds like it's working fine. A good burst of air sound after it shuts off.

Back in business! Thanks for the help guys.
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Old 03-25-2014, 05:01 PM
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FOR 30 years I never had a bad capacitor on anything. In the last 5 years I almost cannot leave the shop without a truck full of capacitors. We are finding they are all made in china now.

Start caps should not blow while it is running. They are just not energized during the run cycle. So if they blew while running they were most likely made in china duds. I swear the china stuff is gonna kill us all. Lead in crayons, melamine dust in their own baby food. They have no morals.

Happy it worked out ok for you.

Hate to ask, but where the 25 dollar one made in the USA?
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Old 03-25-2014, 05:53 PM
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Quote:
Originally Posted by CraigK View Post
FOR 30 years I never had a bad capacitor on anything. In the last 5 years I almost cannot leave the shop without a truck full of capacitors. We are finding they are all made in china now.

Start caps should not blow while it is running. They are just not energized during the run cycle. So if they blew while running they were most likely made in china duds. I swear the china stuff is gonna kill us all. Lead in crayons, melamine dust in their own baby food. They have no morals.

Happy it worked out ok for you.

Hate to ask, but where the 25 dollar one made in the USA?
I have no idea when it blew. I was outside blasting when when it happened. I just assume it blew during a motor start when cycling on.

I don't know where the $27 ones were made. I didn't ask. The $13 ones I bought are Vanguard assembled in Mexico. The one that blew that came with the IR were EPCOS brand and it doesn't say where they were made.
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